* perthread.h (vfork_save): Add ctty, sid, pgid, exitval fields.

(vfork_save::restore_pid): New method.
(vfork_save::restore_exit): New method.
* fork.cc (vfork): Save ctty, sid, pgid and restore them when returning to
"parent".  Use exitval field if exiting but never created a new process.
* syscalls.cc (setsid): Detect when in "vfork" and force an actual fork so that
pid will be allocated (UGLY!).
(getsid): New function.
* dcrt0.cc (do_exit): Use vfork_save::restore_exit method for returning from a
vfork.
* spawn.cc (spawnve): Use vfork_save::{restore_pid,restore_exit} methods for
returning from vfork.
* cygwin.din: Export getsid.
* include/cygwin/version.h: Bump api minor number.
* malloc.cc: #ifdef sYSTRIm for when MORECORE_CANNOT_TRIM is true.

1 files changed, 18 insertions, 2 deletions

diff --git a/winsup/cygwin/perthread.h b/winsup/cygwin/perthread.h
index 48ad97621..f8682ae55 100644
--- a/winsup/cygwin/perthread.h
+++ b/winsup/cygwin/perthread.h
@@ -48,14 +48,30 @@ public:
 };
 
 #if defined (NEED_VFORK)
-struct vfork_save
+class vfork_save
 {
-  int pid;
   jmp_buf j;
+  int exitval;
+ public:
+  int pid;
   DWORD frame[100];
   char **vfork_ebp;
   char **vfork_esp;
+  int ctty;
+  pid_t sid;
+  pid_t pgid;
   int is_active () { return pid < 0; }
+  void restore_pid (int val)
+  {
+    pid = val;
+    longjmp (j, 1);
+  }
+  void restore_exit (int val)
+  {
+    exitval = val;
+    longjmp (j, 1);
+  }
+  friend int vfork ();
 };
 
 class per_thread_vfork : public per_thread